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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A278120 a(n) is numerator of rational z(n) associated with the non-orientable map asymptotics constant p((n+1)/2).

Table of values

n a(n)
0 -1
1 1
2 5
3 25
4 1033
5 15745
6 1599895
7 12116675
8 1519810267
9 5730215335
10 2762191322225
11 155865304045375
12 275016025098532093
13 129172331662700995
14 358829725148742321475
15 524011363178245785875
16 10072731258491333905209253
17 1181576300858987307102335
18 68622390512340213600239902775

List of values

[-1, 1, 5, 25, 1033, 15745, 1599895, 12116675, 1519810267, 5730215335, 2762191322225, 155865304045375, 275016025098532093, 129172331662700995, 358829725148742321475, 524011363178245785875, 10072731258491333905209253, 1181576300858987307102335, 68622390512340213600239902775]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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